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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2021
Feb. 24, 2022
Jun. 30, 2021
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2021    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Trading Symbol CIVB    
Entity Registrant Name Civista Bancshares, Inc.    
Entity Central Index Key 0000944745    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
ICFR Auditor Attestation Flag true    
Entity Incorporation, State or Country Code OH    
Entity File Number 001-36192    
Entity Tax Identification Number 34-1558688    
Entity Address, Address Line One 100 East Water Street    
Entity Address, City or Town Sandusky    
Entity Address, State or Province OH    
Entity Address, Postal Zip Code 44870    
City Area Code 419    
Local Phone Number 625 - 4121    
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Title of 12(b) Security Common shares, no par value    
Security Exchange Name NASDAQ    
Documents Incorporated by Reference Portions of the registrant’s Annual Report to Shareholders for the fiscal year ended December 31, 2021 (the “2021 Annual Report”) are incorporated by reference into Parts I and II of this Form
10-K.
Portions of the registrant’s Proxy Statement for the registrant’s 2022 Annual Meeting of Shareholders to be held on April 19, 2022 (the “2022 Proxy Statement”) are incorporated by reference into Part III of this
Form 10-K.
    
Entity Common Stock, Shares Outstanding   14,888,915  
Entity Public Float     $ 323,533,981
Auditor Name BKD, LLP    
Auditor Firm ID 686    
Auditor Location United States